An object of the invention is to provide a combined sensor capable of suppressing the influence of electrostatic force generated by a potential difference and preventing a reduction in the S/N ratio or a variation in the sensitivity of a sensor.A combined sensor according to the invention includes first and second movable portions and first and second dummy portions provided around the first and second movable portions, which are formed in a layer of a laminated substrate. The first dummy portion and the second dummy portion are electrically separated from each other. A first potential is applied to the first movable portion and the first dummy portion and a second potential is applied to the second movable portion and the second dummy portion (see FIG. 2).